FAQ# DRV-5FLM2U Published: 10/27/2005

Question:Does installation of an AC Drive near a large capacitor bank (power-factor correction) require special consideration?
Answer:Yes. Capacitors are put across the AC power line to correct for lagging power factor due to inductive loads. Motors, relay coils, transformers, etc. are inductive loads. Many times capacitors are switched on and off the line as demand changes. Unfortunately, this switching results in large voltage spikes on the power line which can damage the drives rectifier circuit. To prevent damage use a 5% line reactor on the drive's input. If overvoltage faults are indicated, add dynamic braking -- this will clamp the DC bus.

Product Information:

Product Group:Inverters/Drives
Product:E7 Drive, F7 Drive, G5 Drive 600 Volt, G5HHP Drive, G7 Drive, J7 Drive, P5 Drive 600 Volt, P7 Drive, V7 Drive, V74X Drive, V7N Drive, VS mini
Applications:
Category:Harmonics

Other Information:

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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not superceed it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.